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Incidence, risk factors, and consequences of radiographic pin migration after pinning of pediatric supracondylar humeral fractures.
Journal of Pediatric Orthopedics. Part B 2023 March 8
Current literature on pin migration is inconsistent and its significance is not understood. We aimed to investigate the incidence, magnitude, predictors, and consequences of radiographic pin migration after pediatric supracondylar humeral fractures (SCHF). We retrospectively reviewed pediatric patients treated with reduction and pinning of SCHF at our institution. Baseline and clinical data were collected. Pin migration was assessed by measuring the change in distance between pin tip and humeral cortex on sequential radiographs. Factors associated with pin migration and loss of reduction (LOR) were assessed. Six hundred forty-eight patients and 1506 pins were included; 21%, 5%, and 1% of patients had pin migration ≥5 mm, ≥10 mm, and ≥20 mm respectively. Mean migration in symptomatic patients was 20 mm compared to a migration of 5 mm in all patients with non-negligible migration (P < 0.001). Pin migration > 10 mm was strongly associated with LOR [odds ratio (OR) = 6.91; confidence interval (CI), 2.70-17.68]. Factors associated with increased migration included increased days to pin removal (β = 0.022; CI, 0.002-0.043), migration outwards versus inwards ( = 1.02; CI, 0.21-1.80), and BMI > 95th percentile (OR = 1.63; [1.06-2.50]). Factors not associated with migration included cross-pinning, number of pins, and fracture grade. We identified a 5% incidence of radiographic pin migration ≥ 10 mm and determined the factors associated with it. Pin migration became radiographically significant at >10 mm where it was strongly associated with LOR. Our findings contribute to the understanding of pin migration and suggest that interventions targeting pin migration may decrease the risk of LOR. Level of Evidence: Level III - Retrospective Cohort Study.
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